I own a 2008 HHR SS (first production year). It's equipped with a 5 speed trans, limited slip differential and I had the GM Turbo Upgrade installed when it was almost new. The GM approved upgrade brings the published HP from 260ph to 290hp and the published torque from 260 ft/lb to 315 ft/lb. Most people that you meet on the highway think the HHR SS is only a cosmetic package and do not know what this little demon is capable of.